Hi Zlin,
With respect to TBM's and Malibu's there already has to be a formal type rating, hopefully this helps keep the standard high. I am always worried about inexperienced people in High performance types.
The Harvard can be a very tricky a/c, in the same way an Extra 300 needs to be treated with respect.
Personally I wouldn't be adverse to a system like the Australian's and South African's where ALL types have a formalised type rating system. That may seem a bit silly for people tranfering from a C152 to a C172, but it would be one way of making sure a lot more is covered rather than a perfunctorary check, where im,portant details may be missed.